With the advent of midsummer, the demand for refrigerated trucks in the cold chain logistics and transportation industry has gradually increased. Refrigerator manufacturers want to get the favor of major cold chain logistics companies not only to do the right price, but more importantly, to ensure the refrigeration effect of refrigerated trucks, reduce energy consumption and improve the service life of vehicles. Qingling Isuzu Refrigerated Vehicle To do this, besides the need for high-quality refrigeration units, the overall insulation performance of the car also needs to be improved. How can we improve the insulation performance of refrigerated carriages? This issue will be explained to you from the aspects of refrigerated car plate materials, internal structure and sealing performance. Vacuum insulation board new choice of insulation materials At present, China's commonly used insulation materials are polyurethane foam, polystyrene foam and extruded polystyrene foam three. Polyurethane foam is the most widely used and excellent insulation material. Because of its low thermal conductivity, good thermal insulation performance and high strength, this material has been welcomed by well-known refrigerated truck companies such as Henan Ice Bear, Zhenjiang Kangfei, and Zhenjiang Feichi. The quality polyurethane foam density and bubble diameter are very small. Moreover, polyurethane materials are also suitable for a variety of plate making processes, such as injection foaming, bonding, spraying, and the like. Polystyrene foam is a kind of insulation material made of polystyrene resin. The foam has loose quality, good heat insulation performance, low water absorption, good low-temperature resistance, and easy to cut, but the heat insulation layer of the refrigerated vehicle can only be manufactured by using a bonding process. In developed countries such as Europe and America, this material is basically abandoned. Some small factories in China are still using this material in order to save costs. Compared with polyurethane materials, polystyrene should achieve the same insulation effect, and the thickness of insulation material should increase by at least 20%. The increase in thickness has led to an increase in the quality of refrigerated trucks, reduced load quality, and increased energy consumption. Extruded polystyrene foam is an insulating material that is extruded from polystyrene resin and corresponding additives. This kind of insulation material is similar to the honeycomb structure, and its thickness is uniform, and voids and fracture voids do not occur. Extruded poly vinyl material has the advantages of high compressive strength, low thermal conductivity, low water absorption and long service life. In addition, a new type of insulation material—vacuum insulation board—has been recently developed. This board has better insulation effect and the installation process is more environmentally friendly and energy-saving. At present, this kind of material production technology is quite mature in foreign countries. Ventilation slot design increases circulation speed In most impressions, the interior of the refrigerated cabin body is smooth and flat. In fact, the internal surface structure of the mid- to high-end refrigerator car products is not only uneven but also quite complicated. From June 14th to June 16th this year, at the Asian Fresh Delivery Exhibition held in Shanghai, the refrigerated and insulated cabinets of Songchuan, Henan Province and the refrigerated trucks of Zhenjiang Kangfei have many internal structures that are worthy of peer reference. Refrigerated car produced by Songchuan, Henan Henan Songchuan exhibited a 4.2m refrigerated truck top. In order to ensure the maximum circulation of air-conditioning within the entire cargo compartment, the refrigerated truck bed in Henan Songchuan is equipped with two evaporators. The bottom plate is made of aluminum pipes, and ventilation slots are installed on the side of the car body. The “four-way wind guide†loading improves the circulation speed of cold air and reduces the energy consumption of refrigeration. At the same time, Zhenjiang Kang's new "six-sided ventilated" refrigerated trucks and the "four-sided wind" refrigerated trucks in Songchuan, Henan province have similarities in interior design. Kangfei's new refrigerated truck compartment interior adopts the bead design of food grade glass fiber reinforced plastic skin, and the guide rail floor design, so that no matter how the goods are placed in the car, it will not affect the air circulation system in the car. The front wall is designed with a 3mm ribbed FRP inner skin. The back door is designed as a grooved glass steel skin with a thickness of 3mm and a groove depth of 20mm. Even if the goods are placed close to the back, it will not affect the cold wind passing through the groove. . The side uses a fluted food grade glass-fiber skin design with a thickness of 2.5mm and a groove depth of 20mm to assist in walking. The bottom panel of the carriage body is a rectangular aluminum floor with a guide rail. The height of the guide rail is 25mm. Under the condition that the cargo is full, the bottom can still travel normally. The operating principle of "six-sided ventilation" is roughly the cold wind generated from the refrigeration unit, which is blown to the rear door, passes through the groove on the rear door panel to the floor, and then returns from the groove on the floor to the front wall, from the ribs on the front wall. From the room up to the return air outlet, the groove on the side wall plays the role of assisting the wind. The “six-sided ventilation†refrigerated cabin design can increase the ventilation area by 30%, achieve rapid circulation ventilation, quickly reduce the temperature inside the cabin, and there is no dead space for temperature difference, effectively achieving energy conservation. Moreover, the loading space in the compartment is 9.8% higher than that of the “patch†type air duct, making cleaning easier. Improved sealing performance and more energy-efficient sealing are also important criteria for evaluating the quality of a refrigerated truck. Under normal circumstances, refrigerated vehicles equipped with air curtains are better than those without air curtains and plastic curtains. Especially when the external temperature is higher than 40 degrees, the effect of the air curtain is fully reflected. The curtain of the side door of Qingling refrigerator car can prevent running cold wind. However, the current domestic use is more plastic curtains. At the Asian Fresh Delivery Exhibition, Qingling's multi-temperature refrigerated trucks were equipped with plastic curtains on both side doors and back doors to prevent them from running cold when the door was opened. The new refrigerated car back door of Kang Fei also adopts the plastic curtain design. The Cheng Lite Box Plant Jinglong series refrigerated carriage body adopts a bonding process to improve the sealing performance. In addition, the splicing process of the car body is also closely related to the sealing performance. Now most manufacturers use a rivet stitching process. This process is spliced ​​firmly, but it is also easy to cause poor sealing and cold wind running. Suizhou area Chengli special car plant for the shortcomings of the riveting process, using a bonding process, greatly improving the refrigeration of the refrigerator. In short, with the increasing demand from customers, refrigerated truck companies should no longer stay at the stage of price fights. Customers will increasingly focus on the quality of refrigerated trucks. Whether new energy-saving materials are used or not, the use of reasonable internal structural design and the improvement of the sealing performance of the car body will be the choice most refrigeration vehicle companies will face.
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